Note: Descriptions are shown in the official language in which they were submitted.
1
=
CONTINUOUS SHOT PEENING APPARATUS AND METHOD FOR
COIL SPRING
Technical Field
The present invention relates to an apparatus and a
method for shot Peening a coil spring, and to a
continuous shot peening apparatus and method for a coil
spring, in which a coil spring revolves and rotates at
the same time during shot peening processing to enable
more uniform processing of the coil spring, and a shot
peening process and a preparing process thereof are
simultaneously performed through simultaneous rotation
of a housing in a processing position and a housing in a
preparation position, so that the inventive apparatus
and method require a simpler configuration and a smaller
work space for a shot peening process than those of the
prior arts and can perform shot peening of many coil
springs in a short period of time.
Background Art
In general, a process for manufacturing a coil
spring includes a basic material inspection for a raw
material, a surface peeling step, a heating step, a coil
forming, and a quenching step.
After a primary coil spring has been manufactured
as described above, a series of surface treatment steps
are performed to increase mechanical properties and a
fatigue strength of the coil spring.
That is, after a forming step and a quenching step
of the coil spring have been finished, a surface
treatment is performed through a tempering step, a shot
peening step, a pretreatment step, and a painting step,
and a load test step, a marking step, and a final
inspection step are then performed before a product is
=
CA 2977193 2017-08-24
=
2
released.
In the heat treatment step and the tempering step,
the coil spring is heated to a predetermined
temperature, and, at the same time, an internal residual
stress of the heat-treated coil spring is removed while
the coil spring Passes through a heating furnace and a
tempering furnace in which a predetermined temperature
is maintained, before the coil spring is supplied to a
shot peening apparatus.
In the shot peening step, a small ball, such as a
bead, made of steel, is shot and collided with the
surface of the material, so as to improve mechanical
properties of the material and enhance fatigue life of
the material. Especially, in the shot peening step, the
compressive residual stress distribution of the material
can be formed to have a predetermined depth from the
material surface, so as to increase the fatigue life and
corrosion resistance of the material.
As illustrated in the Korean Registered Patent No.
10-0931135, a conventional shot peening process is
performed by interposing a coil spring between spring
clamping means facing each other in a state where the
coil spring is compressed by the spring clamping means
facing each other, and then rotating and shot peening
the coil spring by means of a shot room apparatus,
wherein the coil spring is moved by a conveyer
apparatus.
However, the conventional technique as described
above requires a clamping means for holding a coil
spring and a conveyer for moving the coil spring, and
thus complicates the apparatus and requires a large
space for installation thereof.
Also, it is difficult to operate a large number of
coil springs in a short time since the coil springs are
CA 2977193 2017-08-24
3
moved using a conveyer.
Technical Problem
The present invention has been made to solve the
problems described above, and an aspect of the present
invention is to provide a continuous shot peening
apparatus and method for a coil spring, in which a coil
spring revolves and rotates at the same time during shot
peening processing to enable more uniform processing of
the coil spring, and a shot peening process and a
preparing process thereof are simultaneously performed
through simultaneous rotation of a housing in a
processing position and a housing in a preparation
position, so that the inventive apparatus and method
require a simpler configuration and a smaller work space
for a shot peening process than those of the prior arts,
can perform shot peening of many coil springs in a short
period of time, and ensure uniform quality of the shot
peened coil spring.
However, an aspect of the present invention is not
limited to the aspects mentioned above, and other
aspects according to the following means or a specific
configuration in the embodiments are not mentioned, but
may be clearly understood by a person skilled in the art
from the description.
Brief Description of the Drawings
FIG. 1 is a schematic diagram illustrating a
continuous shot peening apparatus according to an
embodiment of the present invention;
FIG. 2 is an enlarged schematic diagram
illustrating only a part of a continuous shot peening
apparatus according to an embodiment of the present
invention;
CA 2977193 2018-12-18
4
FIGS. 3 and 4 are schematic diagrams describing a
relationship between a revolution unit and a rotation
unit of a continuous shot peening apparatus according to
an embodiment of the present invention;
FIG. 5 is a schematic diagram describing a moving
unit of a continuous shot peening apparatus according to
an embodiment of the present invention; and
FIG. 6 is a schematic diagram in which stress shot
peening is performed by a continuous shot peening
apparatus according to an embodiment of the present
invention.
Technical Solution
Detailed Description of the Invention
In accordance with the above aspect, the present
invention provides a continuous shot peening apparatus
for a coil spring, the continuous shot peening apparatus
including: a shot peening device (SP) that performs shot
peening processing of a coil spring (CS); and a mounting
part (10) in which the coil spring (CS) is mounted,
wherein the mounting part (10) includes a plurality of
housings (C), a plurality of holding units (100)
disposed in the housings (C) to hold the coil spring
(CS), and driving units (200) disposed in the housings
(C) to cause the holding units (100) to rotate and
revolve, wherein each of the driving units (200) is
disposed in the housing (C) and includes a driving shaft
(S2) rotated by a driving actuator (M2), a rotation unit
(GU) interworking with the driving shaft (S2) to rotate
the holding units (100), and a revolution unit (500)
interworking with each of the driving shaft (S2) and the
holding unit (100) to cause the holding units (100) to
revolve.
The housings (C) include a central housing (C2)
CA 2977193 2018-12-18
5
that receives a plurality of coil springs (CS) therein,
and a first housing (Cl) and a second housing (03)
arranged at horizontally opposite sides of the central
housing (C2), respectively, wherein the holding units
(100) are symmetrically arranged in the horizontal
direction in the first housing (Cl) and the second
housing (C3), respectively, so as to hold opposite sides
of the coil spring (CS) disposed in the central housing
(02), respectively, and the driving units (200) are
symmetrically arranged in the horizontal direction in
the first housing (Cl) and the second housing (03),
respectively.
Each of the holding units (100) includes a holding
part (120) to which the coil spring (CS) is fixed, and a
holding shaft (110) disposed at the holding part (120)
and interworking with the rotation unit (GU).
Rotation units (GU) are disposed in the first
housing (Cl) and the second housing (03), respectively,
and each of the rotation units includes a sun gear (210)
and a plurality of planetary gears (220) arranged around
and gear-coupled with the sun gear (210). The driving
shaft (S2) is disposed at the sun gear (210) to enable
the sun gear to interwork with the driving shaft, the ,
planetary gears have holding shafts (110) arranged
therein, respectively, to enable the planetary gears to
interwork with the holding shafts, and the holding
shafts (110) rotate by means of the rotation of the
planetary gears (220).
Revolution units (500) include bases (540) disposed
on floor surfaces of the first housing (Cl) and the
second housing (03) facing the central housing (02), and
first cylinders (510), second cylinders (520), and third
cylinders (530). The first cylinder (510), the second
cylinder (520), and the third cylinder (530) are
CA 2977193 2018-12-18
6
disposed at the base (540), have the same center, and
are sequentially disposed in an outward direction.
Further, the first cylinder (510), the second cylinder
(520), and the third cylinder (530) each have a shape of
a hollow cylinder, and have a floor surface closed by
the base (540) and an opposite surface thereof opened,
the driving shaft (S2) is inserted in and interworks
with the first cylinder (510), the holding shaft (110)
is inserted in a space between the second cylinder (520)
and the third cylinder (530) and interworks with the
second cylinder (520) and the third cylinder (530), the
holding shaft (110) extends through a floor of the space
between the second cylinder (520) and the third cylinder
(530), and is inserted in the central housing (C2), the
sun gear (210) is disposed on and interworks with the
first cylinder (510), and the planetary gears (220) are
disposed at and interwork with the second cylinder (520)
and the third cylinder (530).
A bearing cover (240) is disposed at a bottom
surface of the planetary gear (220) and an external side
of the holding shaft (110) to interwork with the second
cylinder (520) and the third cylinder (530) and
interwork with the planetary gear (220).
A main shaft (S1) is disposed at one side of the
housing (C), an interworking pulley is rotatably
disposed at an external side of the main shaft (S1) and
interworks with the driving actuator (M2), and a driving
pulley is disposed at the driving shaft (S2) to
interwork with the interworking pulley.
A main actuator (M1) is disposed to drive the main
shaft (Si), wherein the main actuator (M1) includes a
hydraulic cylinder that generates power for moving
forward and backward, a rack that moves forward and
backward by means of the hydraulic cylinder, and a
CA 2977193 2018-12-18
7
pinion that is disposed at the main shaft (Si), and
interworks with the rack so as to be rotated, and the
housing (C) interworks with the main shaft (Si) so as to
be rotated by 180 degrees.
The mounting part further includes moving units
(300) symmetrically disposed in the first housing (Cl)
and the second housing (C3) in the horizontal direction
to move the holding shafts (110) forward and backward,
and the moving units (300) include fixing plates (330)
disposed in the first housing (Cl) and the second
housing (C3) and to which the holding shafts (110) are
fixed, moving actuators (310) that are arranged in the
first housing (Cl) and the second housing (C3),
respectively, and generate power for moving forward and
backward, and operating rods (320) disposed at the
moving actuators (310), respectively, so as to move the
fixing plates (330) forward and backward.
Further, the present invention provides a method of
continually shot peening a coil spring by using the
continuous shot peening apparatus, the method including:
rotating the holding units (100) interworking with the
planetary gears (220) by sequentially rotating the sun
gear (210) and the planetary gears (220) due to rotation
of the driving shaft (S2), and causing the planetary
gears (220) and the holding unit (100) interworking with
the revolution unit (500) to revolve by rotating the
revolution unit (500) due to rotation of the driving
shaft (S2), wherein the coil spring (CS) held by the
holding units (100) is shot peened by the shot peening
device (SP) while rotating and revolving.
After a shot peening treatment of the coil spring
(CS) is finished, the housing (CM) in a shot peening
position and the housing (CC) in a preparing position
are reversely arranged by rotating the main shaft (S1)
CA 2977193 2018-12-18
8
by 180 degrees. Accordingly, the housing (CC) in the
preparing position is oriented toward the shot peening
device (SP) side so as to process the coil spring (CS)
included therein. Meanwhile, after the housing (CM) in
the processing position is disposed in an opposite
direction, the coil spring having been processed is
discharged from the holding units (100), and a new coil
spring is mounted on the holding units (100).
In order to discharge the coil spring having been
processed from the holding units (100), holding parts
(120) holding the coil spring (CS) are separated from
the coil spring (CS) by moving the fixing plate (330)
away from the coil spring (CS) by means of the moving
actuator (310), and then the coil spring (CS) is
discharged.
The new coil spring (CS) is disposed between the
holding parts (120), and then the holding parts (120)
hold the coil spring (CS) by the moving actuator (310).
Advantageous Effects
According to the present invention as described
above, the inventive apparatus and method require a
simpler configuration and a smaller work space for a
shot peening process than those of the prior arts, and
allow a housing in a processing position and a housing
in a preparing position to be alternately oriented
toward a shot peening device. As a result, the apparatus
and method can shot-peen many coil springs in a short
period of time, and can uniformly improve the fatigue
life and corrosion-resistance of all parts of the coil
spring.
CA 2977193 2018-12-18
9
Mode for Carrying Out the Invention
The features and advantages of the present
invention will be .clearer from the following detailed
=
description based on the accompanying drawings.
Terms or words used in the present specification
and the claims should not be interpreted in a
conventional and dictionary meaning, and it should be
noted that technical terms used in the present
specification of the present invention are merely for
the purpose of describing particular embodiments and are
not intended to limit the scope of the present invention
on the basis of the principle in which the inventor may
appropriately define the concept of the terms in order
to explain their own invention in the best way.
In addition, the technical terms used in the
present specification should be interpreted in a meaning
generally understood by a person skilled in the
technical field to which the present invention belongs
unless defined as a particular other meaning in the
present specification, and should not be interpreted in
an excessively expansive meaning, or an excessively
reduced meaning.
Furthermore, a singular form used in the
specification includes a plural form unless contextual
meanings of the singular form and the plural form are
different. In the present application, the term
"include", "comprise", or the like should not be
interpreted in necessarily comprising all the various
components or steps disclosed in the specification,
should be interpreted in that a part of the components
or a part of the steps may not be included, or
additional components or steps may be further included,
and should he interpreted in a meaning and a concept
corresponding to the technical idea of the present
CA 2977193 2017-08-24
10
corresponding to the technical idea of the present
invention.
As illustrated in FIGS. 1 to 6, a shot peening
apparatus according to an embodiment of the present
invention includes a shot peening device SP that
performs shot peening processing of a coil spring CS,
and a mounting part 10 in which the coil spring CS is
mounted.
The shot peening device SP is widely known, and
thus a repetitive description will be omitted.
The mounting part 10 includes a housing C, a
holding unit 100 disposed in the housing C to hold the
coil spring CS, and a driving unit 200 that is disposed
in the housing C and rotates the holding unit 100.
The mounting part includes a plurality of housings
C, one of the housings is disposed on an operating
position of the shot peening device SP to allow shot
peening processing, and the other housings are disposed
at the opposite-side position thereof, and allow the
processed coil spring to be ejected and a new coil
spring to be mounted.
The driving unit 200 is disposed in the housing C
and includes a driving shaft S2 rotated by a driving
actuator M2, a rotation unit GU that interworks with the
driving shaft S2 and rotates the holding unit 100, and a
revolution unit 500 that interworks with each of. the
driving shaft S2 and the holding unit 100, so as to
enable the holding unit 100 to revolve.
That is, the rotation unit GU includes a plurality
of gears and has one side rotated by the driving shaft
S2 and another side interworking with the holding unit
100, so that the holding unit 100 is rotated by rotation
of the driving shaft S2.
A part of the revolution unit 500 interworks with
CA 2977193 2017-11-01
11
the driving shaft S2 and another part thereof interworks
with the holding unit 100, so that the holding unit 100
revolves when the revolution unit 500 is rotated by the
driving shaft S2.
Therefore, the holding unit 100 rotates and
revolves at the same time, so that it is possible to
more uniformly perform shot peening processing.
The housings C include a central housing C2 that
receives a plurality of coil springs CS therein, and a
first housing Cl and a second housing 03 arranged at
horizontally opposite sides of the central housing 02.
That is, holding units 100 and driving units 200
are symmetrically disposed in the first housing Cl and
the second housing C3 with respect to the central
housing C2.
As described above, the holding units 100 are
rotated by the driving units 200, and are horizontally
symmetrically arranged in the first housing Cl, the
central housing C2, and the second housing C3, so as to
hold opposite sides of the coil spring CS.
The driving units 200 are symmetrically arranged in
the horizontal direction with respect to the central
housing 02, and are disposed in the first housing Cl and
the second housing C3, respectively.
As illustrated in FIG. 1, the holding unit 100
includes a holding part 120 to which the coil spring CS
is fixed, and a holding shaft 110 that is disposed at
the holding part 120 and interworks with the rotation
unit GU so as to be rotated.
The holding part 120 may have various shapes as
long as the holding part 120 can hold the coil spring
CS, and, as illustrated, the holding shaft can have a
shape in which opposite-side ends of the holding part
are bent in a direction of the coil spring CS.
CA 2977193 2017-11-01
12
Also, the holding part 120 is fixed to the holding
shaft 110, and a guide 130 is disposed around the
holding shaft 110 so that it is possible to guide a
forward and backward movement of the holding shaft 110.
As illustrated in FIGS. 1 to 3, rotation units GU
are arranged in the first housing Cl and the second
housing C3, respectively, and symmetrically disposed in
the horizontal direction.
Hereinafter, the rotation unit GU disposed in the
first housing Cl will be described.
The rotation unit GU includes a sun gear 210
interworking with the driving shaft S2, and a plurality
of planetary gears 220 that are arranged at an external
side of the sun gear 210 so as to interwork with the sun
gear.
The holding shaft 110 is disposed in and interworks
with the planetary gear 220.
That is, when the driving shaft S2 is rotated by
the driving actuator M2, the sun gear 210 is rotated,
and the planetary gear 220 interworking with the sun
gear is thus rotated.
As a result, since the holding shaft 110 interworks
with the planetary gear 220, the holding shaft 110 is
also rotated, and the coil spring CS is thus rotated.
A bearing cover 240 is fixed to a lower side of the
planetary gear 220, and is rotatably fixed to an
external side of the holding shaft 110.
The revolution unit 500 interworks with each of the
driving shaft S2 and the holding unit 100, to cause the
holding unit 100 to revolve, and revolution units
include bases 540 disposed on floor surfaces of the
first housing Cl and the second housing C3 facing the
central housing C2, and first cylinders 510, second
cylinders 520, and third cylinders 530. The first
CA 2977193 2017-11-01
13
cylinder 510, the second cylinder 520, and the third
cylinder 530 are disposed at the base 540, have the same
center, and are sequentially disposed in an outward
direction.
Hereinafter, the revolution unit 500 disposed in ,
the first housing Cl will be described in detail with
reference to FIGS. 2 and 3.
The first cylinder 510, the second cylinder 520,
and the third cylinder 530 each have a shape of a hollow
cylinder, and have a floor surface closed by the base
540, as described above. Also, in a case of the
revolution unit 500 disposed in the first housing Cl, as
illustrated in FIGS. 2 to 4, the opposite surfaces,
i.e., the left sides in the drawings are opened.
In addition, the driving shaft S2 is inserted in
and interworks with the first cylinder 510, and the sun
gear 210 is disposed on and interworks with the first
cylinder 510. That is, the sun gear 210 rotates when the
driving shaft S2 rotates.
Also, the sun gear 210 interworks with the first
cylinder 510 by means of a fixing piece Fl, and the
first cylinder 510 is thus interworks with each of the
sun gear 210 and the driving shaft S2, so as to be
rotated.
The holding shaft 110 is inserted in a space
between the second cylinder 520 and the third cylinder
530, so as to interwork with the second cylinder 520 and
the third cylinder 530, and the holding shaft 110
extends through a floor of the space between the second
cylinder 520 and the third cylinder 530, and is inserted
in the central housing C2 to hold the coil spring.
Also, the planetary gear 220 is disposed at and
interworks with the second cylinder 520 and the third
cylinder 530.
CA 2977193 2017-11-01
14
To this end, as described above, a bearing cover
240 is disposed at a bottom surface of the planetary
gear 220 and an external side of the holding shaft 110.
That is, the planetary gear 220 interworks with the
bearing cover 240 by means of a fixing piece F2, and the
bearing cover 240 interworks with each of the second
cylinder 520 and the third cylinder 530 by means of
fixing pieces F3.
A separate bearing is disposed between the second
cylinder 520 and the third cylinder 530, so that the
bearing cover 240 may be disposed to be rotatable.
That is, when the entire revolution unit 500 is
rotated by rotation of the sun gear 210, the second
cylinder 520 and the third cylinder 530 are rotated, and
the holding shaft 110 interworking with the cylinders
thus revolves.
Also, the planetary gear 220 is gear-coupled with
the sun gear 210, and is thus rotated by interworking
with rotation of the sun gear 210, and the holding shaft
110 also rotates.
Therefore, the planetary gear 220 and the holding
shaft 110 interworking with the planetary gear 220
rotate and revolve at the same time.
As illustrated in FIG. 3, when the driving shaft S2
rotates in a counterclockwise direction DIR1, each of
the sun gear 210 and the revolution unit 500 rotates in
counterclockwise directions DIR4 and DIR6.
The holding shaft 110 revolves in a clockwise
direction DIR5 by the rotation of the revolution unit
500.
Therefore, the planetary gear 220 interworking with
the holding shaft 110 also revolves in the clockwise
direction DIR5.
Since the planetary gear 220 interworks with the
CA 2977193 2017-11-01
15
sun gear 210 and thus rotates, both of the planetary
gear 220 and the holding shaft 110 not only revolve but
also rotate.
As a result, the coil spring CS fixed to the
holding shaft 110 not only revolves but also rotates.
As illustrates in FIG. 4, a plurality of holding
shafts 110 (for example, four shafts) may be arranged
around the sun gear 210.
This configuration enables a plurality of coil
springs to be processed at once.
As illustrated in FIG. 1, in order to rotate the
driving shaft S2, an interworking pulley is disposed at
a main shaft Si installed at one side of the housing C,
i.e., the first housing Cl or the second housing C3.
The interworking pulley is mounted on a bearing
installed at an external side of the main shaft Si, so
that the interworking pulley is rotatable in a state
where the main shaft Si stops, and the interworking
pulley interworks with the driving actuator M2 by a
power transfer part B.
A driving pulley is fixed to the driving shaft S2,
and the driving pulley interworks with the interworking
pulley by means of the power transfer part B.
That is, the power transfer part B transfers power
generated by the driving actuator M2 to rotate the
interworking pulley, and the interworking pulley
interworks with the driving pulley through the power
transfer part B. Therefore, a rotational force of the
interworking pulley is finally transferred to the
driving pulley, so as to rotate the driving shaft S2.
The power transfer part B may perform a belt
transfer scheme, a chain transfer scheme, or the like,
CA 2977193 2017-11-01
16
but a coil spring to be shot-peened in the present
invention doesn't need to rotate and revolve at a high
speed. Therefore, the driving shaft S2 is naturally
operated at a low speed and it is thus preferable to
adopt the chain transfer scheme, like the embodiment
illustrated in FIG. 1. In this embodiment, the power of
the driving actuator M2 rotates, by means of a chain, an
interworking wheel mounted on the main shaft Si in a
state where the main shaft Si stops and a rotational
force of the interworking wheel is transferred to a
driving wheel fixed to the driving shaft S2 by means of
the chain, so as to rotate the driving shaft S2.
A main actuator M1 is disposed to drive the main
shaft Si, wherein the main actuator M1 includes a
hydraulic cylinder M1-1 that generates power for moving
forward and backward, a rack that is moved forward and
backward by means of the hydraulic cylinder M1-1, and a
pinion that is disposed at the main shaft Si, and
interworks with the rack.
That is, when the rack is moved forward and
backward by the hydraulic cylinder M1-1, the pinion
interworking with the rack is rotated. The main shaft Si
is rotated by the rotating pinion.
The housing C interworks with the main shaft Si,
and is thus rotated by 180 degrees.
That is, multiple housings C are arranged as
described above, one housing CM of the housings is
disposed in the processing position oriented toward a
shot peening side, and the other housings CC are
disposed at a preparing position which is an opposite
side thereof.
When processing of the coil spring received in the
housing CM disposed in the processing position has
finished, the housing CM disposed in the processing
CA 2977193 2017-11-01
17
position and the housing CC disposed in the preparing
position exchange their positions with each other by 180
degrees rotation of the main shaft Si.
Accordingly, the coil spring received in the
housing newly disposed in the processing position is
shot-peened, and, at the same time, the coil spring
having been processed is ejected from the preparing
position and then a new coil spring is mounted.
That is, according to the present invention, a
plurality of coil springs can be simultaneously
processed, and a processing process and a preparing
process can be simultaneously performed, thereby
improving processing efficiency. Further, multiple
housings are used while rotating, thereby reducing a
work space.
As illustrated in FIG. 1, a housing interworking
part at which a part of the housing C is connected to
the main shaft Si is disposed in order to interwork the
main shaft Si with the housing C.
The housing interworking part may have various
shapes as long as the housing interworking part can
connect between the main shaft Si and the housing C.
As illustrated in FIGS. 1 and 5, the continuous
shot peening apparatus for a coil spring according to
the present invention has a moving unit 300 which lifts
and lowers the holding shaft 110.
Moving units 300 having the same configuration are
arranged in the first housing Cl and the second housing
C3, respectively, and are symmetrical in the horizontal
direction.
Hereinafter, a moving unit disposed in the first
housing Cl will be described.
The moving unit 300 includes a fixing plate 330
disposed in the first housing Cl and to which the
CA 2977193 2017-11-01
18
holding shaft 110 is fixed, and a moving actuator 310
that is disposed in the first housing Cl and generates
power for moving forward and backward.
An operating rod 320 is disposed at the moving
actuator 310 and moves the fixing plate 330 forward and
backward.
That is, when a length of the operating rod 320
increases toward a left side in the drawing, the fixing
plate 330 moves in a left-side direction in the drawing,
and the holding shaft 110 thus moves to the left side in
the drawing.
Also, the holding shaft 110 moves in an opposite
direction thereof by means of the moving unit 300
disposed in the second housing C3, so that the coil
spring CS is separated from the holding part 120
installed at the holding shaft 110.
By the moving units 300 as described above, the
coil spring CS is separated from the holding units 100,
and the coil spring is ejected by using a configuration
such as a robot arm.
The holding part 120 may have various
configurations as long as the holding part 120 can be
fixed to the holding shaft 110.
The moving units 300 are arranged at opposite sides
of the coil spring CS, respectively, as described above,
to adjust a distance between holding parts 120 to be
shorter than a length of the coil spring CS, so that a
stress shot peening may progress in a state where the
coil spring has been compressed.
That is, as illustrated in a left side of FIG. 6,
the opposite holding shafts 110 move in the central
direction of the coil spring CS so as to compress the
coil spring CS between the holding parts 120, and the
compressed coil is stress-shot-peened, so that an
CA 2977193 2017-11-01
19
internal stress of the coil spring can be further
increased.
On the contrary, in order to eject or mount the
coil spring CS, the coil spring CS is separated from the
holding part 120 of the holding shaft 110 by moving the
holding shaft 110 in an opposite direction thereof.
Hereinafter, a method of shot peening a coil spring
by using the continuous shot peening apparatus of the
present invention, as described with reference to the
FIGS. 1 to 6, will be described.
As illustrated in FIG. 1, a coil spring CS is shot
peened since the housing CM in the processing position
is oriented toward the shot peening device SP.
Also, the housing CC in the preparing position is
disposed to be opposite to the housing CM in the
processing position, the coil spring having been
processed is ejected from the housing in the preparing
position, and a new coil spring is mounted in the
housing in the preparing position.
After that, the housing CC in the preparing
position is oriented toward the shot peening device SP
by rotating the housing by 180 degrees, so as to allow
shot peening processing, and the coil spring received in
the housing CM, which has been located in the processing
position, is ejected.
To this end, firstly, the holding unit 100
interworking with the planetary gear 220 is rotated by
sequentially rotating the sun gear 210 and the planetary
gear 220 due to rotation of the driving shaft S2 in the
housing CM in the processing position, and, meanwhile,
the planetary gear 220 and the holding unit 100, which
interwork with the revolution unit 500, revolve by
rotating the revolution unit 500 due to rotation of the
driving shaft S2.
CA 2977193 2017-11-01
20
revolves at the same time, the coil spring CS is shot
peened by the shot peening device SP.
After a shot peening treatment of the coil spring
CS is finished in the housing CM in the processing
.positIon, the housing CC in the preparing position is
oriented toward the shot peening device SP side by
rotating the main shaft Si by 180 degrees, so that the
coil spring CS included therein is processed.
Also, the housing CM which has been located in the
processing position changes its position to an opposite
side thereof, i.e., the preparing position in which the
housing CC has been located.
At this time, the coil spring which has been
processed is discharged from the holding units 100 by a
robot arm, and a .new coil spring is mounted at the
holding units 100 by the robot arm.
Also, in order to discharge the Processed coil
spring from the holding unit 100, the holding parts 120
installed at opposite sides of the coil spring CS are
separated from the coil spring CS by moving the fixing
plate 330 away from the coil spring CS by means of the
moving actuator 310, and then the coil spring CS is
discharged.
After that, a new coil spring CS is disposed
between the holding parts 120 arranged in the horizontal
direction, and then the moving actuator 310 enables the
holding part 120 to hold opposite sides of the coil
spring CS, so that shot peening processing is performed
after the coil spring is disposed at a shot peening
device side.
According to the present invention as described
above, a coil spring can be continuously processed.
Embodiments of the present invention have been
described above in detail with reference to the
CA 2977193 2017-08-24
21
accompanying drawings. However, a person skilled in the
technical field to which the present invention belongs
may understand that the present invention may be
implemented as other particular embodiments without
modifying the technical idea or essential feature of the
present invention.
Therefore, it should be understood that the
embodiments described above is exemplary in all aspects,
not limited, and the scope of the present invention
described in the detail description is indicated by the
following claims and it should be interpreted that the
meanings and scopes of the claims and all the
modifications and changes derived from the same concept
thereof are included in the scope of the present
invention.
CA 2977193 2017-08-24
